摘要
为研究隔震连续梁桥的地震易损性,提供该类桥梁的抗震设计依据,本文以一座(55+4×90+55)m的连续梁桥为研究对象,采用摩擦摆隔震支座进行隔震改造。选取典型桥墩,利用OpenSees软件分别建立了隔震桥墩和非隔震桥墩的有限元动力分析模型。根据场地类型合理选取了20条人工合成地震波,并采用增量动力分析方法(IDA)得到了隔震前后的桥墩以及隔震支座的地震响应。定义了构件破坏的4种损伤状态,并以桥墩的位移延性比和隔震支座的相对位移作为各自的损伤指标,利用线性概率地震需求函数进行回归拟合分析,计算了非隔震桥墩、隔震桥墩和隔震支座在不同损伤状态下的损伤概率,建立了三者的地震易损性曲线并进行了对比分析。分析结果表明:与非隔震桥墩相比,不同损伤状态对应的隔震桥墩的易损性曲线较为平缓,且超越概率均明显降低,表明隔震支座在一定程度上消耗了地震能量,保护了结构;隔震支座的损伤概率比桥墩高,表明隔震支座在地震中比桥墩更容易遭受破坏,这符合抗震设计的初衷。
In order to study the seismic vulnerability of isolated continuous beam bridges and provide the basis for seismic design of such bridges, this paper takes a continuous beam bridge with span arrangement of(55+4×90+55) m as the research object, and the friction pendulum bearing is used for seismic isolation transformation. The typical pier is selected, and the finite element dynamic analysis model of the isolated pier and non-isolated pier are established by OpenSees software respectively. 20 synthetic seismic waves are selected according to the site type, and the seismic responses of the piers and bearings are obtained by incremental dynamic analysis method(IDA). Four damage states of component failure are defined, and the displacement ductility ratio of piers and relative displacement of isolation bearings are taken as damage indices. Based on the regression fitting analysis of linear probability seismic demand function, the damage probability of non-isolated pier, isolated pier and isolation bearing under different damage states are calculated, and the seismic vulnerability curves are established and compared. The results show that the vulnerability curves of isolated pier under different damage stages is gentler and the exceeding probability is significantly reduced compared with non-isolated pier, which indicates that the isolation bearing can consume seismic energy to a certain extent and protect the structure. The damage probability of isolation bearing is higher than that of piers, illustrating that the isolation bearing is more vulnerable to damage in earthquake.
作者
贾毅
奎智尧
田浩
张建新
高能
Jia Yi;Kui Zhi-yao;Tian Hao;Zhang Jian-xin;Gao Neng(Faculy of Civil Engineering and Mechanies,Kunming University of Science and Technology,Kunming 650500,China;Earthquake Engineering Research Center of Yunnan,Kunming 650500,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《工程抗震与加固改造》
北大核心
2021年第6期55-64,共10页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金资助项目(52068037)
昆明理工大学引进人才科研启动基金项目(KKZ3202006063)。
关键词
连续梁桥
地震易损性
增量动力分析
隔震支座
桥墩
易损性曲线
continuous beam bridge
seismic vulnerability
incremental dynamic analysis
isolation bearing
pier
vulnerability curve
